About

Below are some problems related to computer security (specifically poorly implemented security). Do Them. You are free to use any language and environment you like to complete them. The problems require familiarity with programming, but not necessarily with applied cryptography or computer security in general. An understanding of how some of the algorithms and tools in the problems work will be of use, so as a starting point you can find some resources to help you begin here. If this topic is new to you, you may want to start with the Tutorial Problems.

Problems

Vigenère

One of the most difficult problems to pronounce

Solved by 104
Caesar

Should probably stick to the salad

Solved by 233
Backdoored PRNG

Exploit a backdoor in an elliptic curve based PRNG

Solved by 23
Bad Entropy

It's easy to generate bad symmetric keys

Solved by 63
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